pinion seal... this is confusing

what should be the pinion seal on my 489 ?

I have at this moment the 7215 national seal, but have failed twice in 3 or 4 years

yes I have read all the guides about the 8.75 axle, but trust me is still confusing. Specially when you go to rockauto and appears 3 or 4 diff seals.

5126 for the 489 and 9.25 rears. A 7216 is for the 742.

is it posible the 7215 is a replacement PN for 5126 or backwards ?

the 7215 I got from a Mopar dealer is leather... if makes some difference

The 5126 number is correct for National or Timken seals, and available at almost all part stores. The 7215 from what I have researched is for the 657 third member.

found on a National seal PDF chart there is an outer diameter difference between 7215 and 5126 seals, being the fist one bigger by 0.183" thats too much diff to make it fit on my case.

I don't get it.

The 5126 seal fits 489 and 741 castings.

So yokes are the same between 741s and 489s ? ( aside the cross joint size )

Yes.

742 10 spline yoke/7216 seal
741 10 spline or 29 spline yoke/5126 seal
489 10 spline or 29 spline yoke/5126 seal
9 1/4" 29 spline yoke/5126 seal

nice.

still wondering why I got from the seller the 7215, twice... and made it fit... national catalog states 3" outer diameter


althought he overwritte on box with a pen the number 5126

Don't use an aftermarket leather seal. They always leak.

ok

BTW Cass, there is a guy on FB needing the spider cross shafts for 8.75 clutch SG... do you have them ?

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So yokes are the same between 741s and 489s ? ( aside the cross joint size )

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The u/joint size can be the same in all three 8 3/4 case set ups depending on the application even a lot of the half ton 4X4's used the small joint.